/*
 * Alloy Analyzer
 * Copyright (c) 2002 Massachusetts Institute of Technology
 *
 * The Alloy Analyzer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The Alloy Analyzer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Alloy Analyzer; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package alloy.bool;


/**
 * Base class for BooleanFormula nodes that store a reference to a single subexpression
 * (e.g. GBF_Not and the quantifiers)
 */
abstract class GBF_OneExprBase extends BooleanFormula {
    BooleanFormula expr;

    protected GBF_OneExprBase(BooleanFormula expr) { this.expr = expr; }
    BooleanFormula getExpr() { return expr; }
    int getNumVars() { return expr.getNumVars(); }

    protected boolean checkConstantValued() { return expr.isConstantValued(); }

    public boolean equals(Object obj_) {
	return obj_.getClass().equals(this.getClass()) &&
	    ((GBF_OneExprBase)obj_).expr.equals(this.expr);
    }
}


